language and tweaks

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2432 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
tabasco did not correctly order sites when 'use' was a dendrogram
because heatmap rearranged the once arranged data.

site.ind/sp.ind take a preference over 'use' also in tabasco (like
documented for vegemite) or given an error.

'select' or 'site.ind' given an error when 'use' is dendrogram/tree.

Rd page updated for tabasco.


git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2433 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Merge branch 'r-forge-svn-local'